I had the same issue with an EzRun 25A / 7800 unit I bought for my mini-t

The ESC would light up and appear to be calibrating correctly, however, I could never get the motor to spin. I only heard very very faint ticks or beeps, which I never thought was correct. After several attempts at changing batteries, connectors, etc. I figured that the ESC was bad.

Nitrorcx.com (where I got mine from) apparently agreed with me because they sent me a completely new combo. That one works great and I have no issues at all.

The beeping noise is quite audible, so if yours is very quiet or just "ticking" then my guess is your ESC is toast.